4th IWA Symposium on Lake and Reservoir Management 2017 (IWA L&RM 2017) will be held in Shanghai, China from May 22-26, 2017.
Lakes and reservoirs have gradually become major drinking water sources in most cities with the increasing demand for water resources and the emerging uncertainty of raw water quality and quantity of rivers. Lakes and reservoirs as water sources are playing an increasingly important role. Examples include Miyun Reservoir in Bejing, Danjiangkou Reservoir along the mid route of South-to-north Water Diversion Project and Taihu Lake in Wuxi etc. Even those cities adjacent to rivers, such as cities along the middle and lower reaches of Yellow River, have taken reservoirs as supplemental or emergent water sources to ensure water quality and quantity. Water quality problems vary with separate lakes. Even in one lake, water quality problems vary with different years and seasons. As the largest valley reservoir in North China Plain, Miyun Reservoir is the leading surface water sources in Beijing with the biggest depth of 43.5m and largest storage capacity of 4.375 billion m3 , supplying 772.5 million m3 raw water per year. With the fall of water level, odor-generating algae grows seasonally in shallow waters in autumns, leading to odor problems. Other cases of water quality problems in lakes and reservoirs include algae bloom in Xili Reservoir in springs in Shenzhen, fishy odor caused by under-ice algae bloom in winters in reservoirs along Yellow River and cyanobacteria bloom in summers caused by eutrophication in Taihu Lake, Donghu Lake and Dianchi Lake, bringing about deterioration of water quality. Consequently, it is important to analyze the causes of different types of water quality problems in lakes and reservoirs, developing sound control policies and establishing domestic and overseas experience-sharing platform on lakes and reservoirs management in order that China’s overall management level of lakes and reservoirs as water sources could be promoted.
Shanghai has been constructing reservoirs for years to improve water sources quality and to meet the demand for water quantity. Up to now, Chenhang Reservoir, Qingcaosha Reservoir and Dongfengxisha Reservoir that take raw water from Yangtze River have been built and Jinze Reservoir that is located in the upper reaches of Huangpu River is under construction, which makes Shanghai a typical megalopolis that takes reservoirs as its leading water sources. Built in 1996 and located in the south bank of Yangtze River estuary, Chenhang Reservoir is with storage capacity of 8.3 million m3 and supplies 2.06 million m3 raw water per day, accounting for 12% of the total water supply in Shanghai. As the largest estuary reservoir in the world , Qingcaosha Reservoir is located in the south and north passage bifurcation of Yangtze River, northern Changxing Island. The reservoir is built in 2011 and is with effective storage capacity of 553 million m3, providing.7.31 million m3 raw water per day, accounting for over 50% of the total raw water supply in Shanghai and serving over 13 million people. Built in 2014, Dongfengxisha Reservoir is located in the north bank of south passage of Yangtze River estuary, southwest Chongming Island. The reservoir is with effective storage of 8.9 million m3. The near-term and long-term water supply capacity per day is 215 thousand m3 and 400 thousand m3 respectively. Located in the upper reaches of Huangpu River, Jinze Reservoir under construction is with storage capacity of 9.1 million m3 and designed water supply capacity of 3.51 million m3 per day. It is planned the reservoir is available to put into operation at the end of 2016.
There are particular water quality risks for reservoirs as water sources in Shanghai. For instances, Qingcaosha Reservoir is facing salt tide intrusion in winters since the reservoir is adjacent to Yangtze River estuary. Besides, odor problems occur in summers due to the relatively high concentration of nutrients carried by the inflow raw water from Yangtze River and the long period of retention time of raw water in the reservoir. Through research and sound scheduling in the past years, rich experience in salt water discharging and fresh water storage, algae control and odor removal has been acquired. Consequently, it is meaningful to hold the conference in Shanghai.
We hope to facilitate collaboration and create professional linkages among researchers worldwide. Thereare a variety of opportunities for you to participate through attending, presenting, exhibiting and sponsoring. We will offer our true hospitality to all professionals and colleagues during the conference. I sincerely wish to see you all on May 22-26, 2017.